Sudoku Phistomephel Ring

Simon Anthony (from Cracking the Cryptic) reveals the Phistomephel Ring - a hidden feature of ALL Sudoku puzzles. Second video is here: https://youtu.be/h8AulgkjyIc More links & stuff in full description below ↓↓↓ Cracking the Cryptic: https://www.youtube.com/c/CrackingTheCryptic Another Numberphile video about Sudoku: https://youtu.be/MlyTq-xVkQE Our thanks also to the legendary Phistomephel. Patreon: http://www.patreon.com/numberphile Numberphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: https://bit.ly/numberphile-janestreet We're also supported by the Simons Laufer Mathematical Sciences Institute (formerly MSRI): http://bit.ly/MSRINumberphile Our thanks also to the Simons Foundation: https://www.simonsfoundation.org NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Subscribe: http://bit.ly/Numberphile_Sub Videos by Brady Haran Numberphile T-Shirts and Merch: https://teespring.com/stores/numberphile Brady's videos subreddit: http://www.reddit.com/r/BradyHaran/ Brady's latest videos across all channels: http://www.bradyharanblog.com/ Sign up for (occasional) emails: http://eepurl.com/YdjL9 Special thanks to these Patrons: Juan Benet Matthew Feinberg Jeff Straathof Ben Delo Ken Baron Andy B Michael Dunworth Yana Chernobilsky James Bissonette Jubal John Ben White Andrei M Burke RAD Donato Matthew Schuster Ron Hochsprung Ubiquity Ventures John Zelinka Gnare Heather Liu Ian George Walker Tracy Parry Arnas Bernd Sing Valentin Alex Khein Doug Hoffman John Loach Michael Rops